The ultrasonic characteristics study of weak gas leakage

Wang, Dongying; Zhao, Fengyang; Wang, Tao

doi:10.1109/fpm.2015.7337201

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…According to equations ( 4) and ( 5), the relationship between differential pressure and leakage can be obtained, as shown in equation (6). Theoretically, when the equilibrium time is long enough, the differential of 𝑇 𝑤 and 𝑇 𝑚 is equal to 0, the above equation ( 6) can be simplified as follows:…”

Section: Charging Process and Measurement Processmentioning

confidence: 99%

“…Ultrasonic method is a kind of acoustic emission detection method, which has a lot of research and improvement. Wang proposed that in order to obtain more accurate leakage location information and determine the location of leakage holes in three-dimensional space, an ultrasonic leakage location method based on multi algorithm data fusion is proposed [5], and an ultrasonic method based on data fusion and neural network is proposed to identify the leakage state of the measured object [6]. Piazzetta studied two detection methods to analyze the acoustic data generated by gas leakage based on active arrangement and ultrasonic transducer measurement, and the ultrasonic transmitter that placed in the pipeline to detect fluid from the inside of the container [7].…”

Section: Introductionmentioning

confidence: 99%

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Study on Gas Leakage Detection and Pressure Difference Identification by Asymmetric Differential Pressure Method

Yan

Chang

Wang

et al. 2021

Preprint

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As the most common actuator in the pneumatic system, the excellent air tightness of the tank is the key to meet the use requirements of automatic equipment. This paper introduces the common air tightness detection contents, and models the inflation and detection process of the differential pressure method. In order to break away from the restriction on the detection efficiency caused by the asynchronous temperature recovery of the two chambers in the asymmetric differential pressure method, the differential calculation of directly detected pressure difference is replaced by the pressure difference substitute formula. The influence of various parameters in the fitting formula is analyzed by simulation, and the effectiveness of this method is verified by experiments.

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Section: Charging Process and Measurement Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Gas Leakage Detection and Pressure Difference Identification by Asymmetric Differential Pressure Method

Yan

Chang

Wang

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Wang et al proposed an ultrasonic leakage location method based on multialgorithm data fusion [12] and a cylindrical container gas leakage location method based on annular ultrasonic sensor array [13]. In addition, there is a negative pressure wave pipeline leakage detection method [14], or establish the functional relationship between the leakage and other influencing factors of the product, to judge the leakage [15]. In general, ultrasound testing method is difficult to be used in the running devices in practice.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Influence Factors of Differential Pressure Detection of Gas Leakage

et al. 2022

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Pneumatic technology takes compressed gas as the power source, but the leakage of gas in the pipeline due to poor sealing or pipeline rupture affects the accuracy of pneumatic control, the flow of gas transmission, and even the emission of harmful gas. The air tightness of differential pressure method has broad significance in the study of tight leakage because of its simple operation, short detection time, and high precision. Bubbling method, acoustic emission detection method, and direct pressure detection method have the characteristics of difficult operation, environmental sensitivity and low detection accuracy. They are not suitable for effective and high-precision detection of leakage in harsh environment. The air tightness detection method of differential pressure method has the advantages of simple operation, short detection time, and high accuracy. It has extensive significance in the research of air tightness leakage. At present, the focus of differential pressure method is to keep the same charging state of the master tank and the tested tank. However, when the shape of the tested tank is irregular or difficult to copy, the influence of different master tank on differential pressure method leakage detection needs to be considered. In this study, a gas leakage flow calculation model is established. The influence of the inherent parameters of the master tank on the calculation of the pressure difference, temperature difference, and leakage between the two cavities is analyzed in the simulation. Finally, the master tank is set as a quasi-isothermal cavity, and the tested tank is set as 3 L and 5 L air tanks for leakage test. The maximum error of experiment of 3 L tank reaches 39 mL/min at the later stage of measurement, with a detection deviation of 14.4%. The maximum error of experiment of 5 L tank is 412.4 mL/min, with a deviation rate of 28.3%. This method can detect leakage with high precision in harsh environment.

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“…Despite the success in business achieved by integrated stoves, they also cannot avoid the common problem faced by traditional domestic gas appliances, namely, the potential risk of causing an indoor gas explosion. , Figure shows the ratio of indoor gas explosions to the number of total gas explosion accidents that occurred from 2017 to 2021, indicating that indoor gas explosions (mainly attributed to gas-burning appliances like integrated stoves) account for more than half of gas explosion accidents, which is also the main cause of injuries and deaths. Numerous accident investigation reports demonstrate that a major cause of indoor gas explosion accidents is the gas microleakage caused by the aging or corrosion of gas piping, which results in gas diffusion and accumulation in domestic gas appliances. − …”

Section: Introductionmentioning

confidence: 99%

“…Numerous accident investigation reports demonstrate that a major cause of indoor gas explosion accidents is the gas microleakage caused by the aging or corrosion of gas piping, which results in gas diffusion and accumulation in domestic gas appliances. 6 − 8 …”

Section: Introductionmentioning

confidence: 99%

CFD Analysis on the Diffusion and Accumulation Characteristics of Microleakage LPG in an Integrated Stove

Jin

Lin

Zhao³

et al. 2022

ACS Omega

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Gas microleakage, which results in gas diffusion and accumulation in domestic gas appliances, is the leading cause of indoor gas explosion accidents. To research the diffusion and accumulation characteristics of microleakage gas in domestic gas appliances, this study took an integrated stove as the research object and analyzed the effects of different leakage rates and leakage locations on the diffusion and accumulation characteristics of microleakage liquefied petroleum gas (LPG) in its interior using the computational fluid dynamics (CFD) numerical simulation method. The results show that microleakage LPG is characterized by a downward diffusion flow driven by gravity and the concentration inside the integrated stove cavity generally increases with the increase of leakage time; however, the spatial distribution is extremely inhomogeneous. In addition, the volume of the dangerous area rapidly changes with the continuous accumulation of microleakage LPG, occupying more than 50% of the cavity volume. Microleakage LPG diffusion and accumulation process are highly similar under different leakage rates; on the contrary, the location of the leakage source is closely related to the diffusion and accumulation characteristics. The diffusion distribution and accumulation position of microleakage LPG at different leakage locations present obvious differences. Typically, there is a concentration difference of 0.1−0.2% between the top and the bottom when the leakage source is located above the gas stove baffle and a concentration difference of 1.0−1.3% between the top and the bottom when the leakage source is located below the gas stove baffle. In addition, the difference in the leakage location has a significant impact on the time the concentration of LPG reaches the critical concentration, which indicates that the combustion and explosion risk of different leakage locations are highly related to the leakage time. The research can provide certain technical support for microleakage gas explosion accident prevention.

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The ultrasonic characteristics study of weak gas leakage

Cited by 10 publications

References 7 publications

Study on Gas Leakage Detection and Pressure Difference Identification by Asymmetric Differential Pressure Method

Study on Gas Leakage Detection and Pressure Difference Identification by Asymmetric Differential Pressure Method

Analysis on Influence Factors of Differential Pressure Detection of Gas Leakage

CFD Analysis on the Diffusion and Accumulation Characteristics of Microleakage LPG in an Integrated Stove

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